Our only hope for a 42/53 receiver is the Cold Steel, right now. The WLA camming section is too short for the M53 kits
Burnt Capital has not posted any updates on their one-piece receiver since Nov 07. If he is on-track (anyone know?), a sample should be heading to BATFE for type classification. Don't hold your breath!
WLA may be able to offer some of their rear receiver halfs later in 2008 but, insiders have expressed some real doubt about that comming to fruition.
I wonder if Century will offer the WLA sections for sale at some point? Afterall, WLA has been making these for Century.